Radautocompletebox dropdown stay open on multiselecting

[Kai]

Hello,

I am using a RadAutoCompleteBox with multiselecting. 

I would like a user to be able to open the dropdown by clicking on the AutoCompleteBox and to be able to select all needed items in one go.

In general it should have the same behaviour like the StaysOpenOnEdit property of the RadComboBox.

Thanks in advance

 

Regards,

Kai

[Kai]

Any update on that ?

[Martin Ivanov]

Hello Kai,

The required functionality is not supported by RadAutoCompleteBox. To achieve your requirement you can use some custom code. For example, you can handle the click event in the dropdown part of the control and manually select the items. Here is one way to do this:

public class CustomAutoCompleteBox : RadAutoCompleteBox
{
	private RadListBox itemsControlPart;

	public override void OnApplyTemplate()
	{
		base.OnApplyTemplate();

		itemsControlPart = (RadListBox)GetTemplateChild("PART_ListBox");
		itemsControlPart.AddHandler(RadListBox.PreviewMouseLeftButtonDownEvent, new RoutedEventHandler(OnListBoxPreviewMouseLeftButtonDown), true);

	}

	private void OnListBoxPreviewMouseLeftButtonDown(object sender, RoutedEventArgs e)
	{
		e.Handled = true;

		var containerUnderMouse = ((FrameworkElement)e.OriginalSource).ParentOfType<RadListBoxItem>();
		if (containerUnderMouse != null)
		{
			if (this.SelectionMode == Telerik.Windows.Controls.Primitives.AutoCompleteSelectionMode.Single)
			{
				itemsControlPart.SelectedItem = containerUnderMouse.DataContext;
				SelectedItem = containerUnderMouse.DataContext;
			}
			else
			{
				if (itemsControlPart.SelectedItems.Contains(containerUnderMouse.DataContext))
				{
					itemsControlPart.SelectedItems.Remove(containerUnderMouse.DataContext);
					((IList)SelectedItems).Remove(containerUnderMouse.DataContext);
				}
				else
				{
					itemsControlPart.SelectedItems.Add(containerUnderMouse.DataContext);
					((IList)SelectedItems).Add(containerUnderMouse.DataContext);
				}
			}
			
		}

		var textBoxPart = this.FindChildByType<RadWatermarkTextBox>();
		textBoxPart.Focus();
	}
}

I hope that helps.

Regards,
Martin Ivanov
Progress Telerik

[Kai]

Could you provide me with a sample project with this functionality?

[Martin Ivanov]

I've attached a small example showing this.

You can also take a look at the RadMultiColumnComboBox control which supports this functionality.